I really don't agree. Rijndael and DES are different algorithm. SHA-512/256 is a made-up algorithm that you need to be aware of. Again I'm talking about "misuse" here. SHA-2 is vulnerable to misuse even if SHA-512/256 is not.
I might be a bit. Although, I don't feel like it's too far from the kind of misuse we've pointed out with nonce re-use in AES-GCM or nonce re-use in DSA/ECDSA.
Anyway that was my point! Just wanted to write it up :)
